#1618 - ENH: Add @Sum ... as short hand for @Aggregation("sum(<property name>)")

pom.xml

@@ -117,7 +117,7 @@
     <dependency>
       <groupId>io.ebean</groupId>
       <artifactId>ebean-annotation</artifactId>
-      <version>4.4</version>
+      <version>4.5</version>
     </dependency>
 
     <dependency>

src/main/java/io/ebeaninternal/server/deploy/parse/AnnotationFields.java

@@ -25,6 +25,7 @@ import io.ebean.annotation.Index;
 import io.ebean.annotation.JsonIgnore;
 import io.ebean.annotation.Length;
 import io.ebean.annotation.SoftDelete;
+import io.ebean.annotation.Sum;
 import io.ebean.annotation.TenantId;
 import io.ebean.annotation.UnmappedJson;
 import io.ebean.annotation.UpdatedTimestamp;
@@ -285,6 +286,10 @@ public class AnnotationFields extends AnnotationParser {
     if (aggregation != null) {
       prop.setAggregation(aggregation.value());
     }
+    Sum sum = get(prop, Sum.class);
+    if (sum != null) {
+      prop.setAggregation("sum(" + prop.getName() + ")");
+    }
 
     Version version = get(prop, Version.class);
     if (version != null) {

src/test/java/org/tests/model/aggregation/DMachineStatsAgg.java

@@ -1,6 +1,7 @@
 package org.tests.model.aggregation;
 
 import io.ebean.annotation.Aggregation;
+import io.ebean.annotation.Sum;
 import io.ebean.annotation.View;
 
 import javax.persistence.Entity;
@@ -17,16 +18,10 @@ public class DMachineStatsAgg {
 
   LocalDate date;
 
-  /**
-   * Matching with column underscore.
-   */
-  @Aggregation("sum(totalKms)")
+  @Sum  // which is the same as: @Aggregation("sum(totalKms)")
   long totalKms;
 
-  /**
-   * Matching with no underscore.
-   */
-  @Aggregation("sum(hours)")
+  @Aggregation("sum(hours)") // which is the same as: @Sum
   long hours;
 
   @Aggregation("max(rate)")